feat(wm): optionally await config completion

This commit introduces a new flag to komorebi and komorebic,
--await-configuration, which when enabled, will stop the process from
processing window manager events and updating the layout until the
'komorebic complete-configuration' command has been sent.

This should typically be added at the end of a user's komorebi.ahk
configuration file if they decide to enable this feature.

resolve #190

komorebi-core/src/lib.rs

@@ -96,6 +96,7 @@ pub enum SocketMessage {
     // Configuration
     ReloadConfiguration,
     WatchConfiguration(bool),
+    CompleteConfiguration,
     InvisibleBorders(Rect),
     WorkAreaOffset(Rect),
     ResizeDelta(i32),